Where is the optimal position for the dipstick when the engine is cold?
2 Answers
The dipstick has two marks indicating the minimum and maximum oil levels. Generally, the oil level should be between these two marks, and according to empirical values, the oil volume between these two marks is approximately one liter. Here are some related details: Function: The dipstick measures the static oil level height, reflecting whether the engine oil volume is within a reasonable range. Standard dipsticks have clear upper and lower limits, and it's sufficient to ensure the measured oil level is between these two marks. Ideally, the oil level should be at the midpoint. Note: It's important to remember that more oil is not necessarily better. Higher oil levels actually increase engine resistance (since the crankshaft needs to continuously agitate the oil in the oil pan for splash lubrication). Ideally, the oil level should be slightly below the midpoint, as this minimizes engine resistance and fuel consumption while maintaining stable lubrication performance.
The optimal position for the cold engine oil dipstick is between the min and max marks, ideally slightly above the middle—not too close to the upper limit nor too low. After years of driving, I always ensure the car is parked on level ground and the engine has cooled for at least half an hour so the oil settles for an accurate reading. Pull out the dipstick, wipe off the oil residue, reinsert it, then check the fresh oil film level. Too little oil accelerates engine wear and increases noise; too much causes foaming, raises pressure, and damages the pump. It's recommended to check monthly or before long trips to maintain good car condition. If the oil is low, top up with the same type; if overfilled, use a professional suction tube to remove excess, saving money and hassle.
